Display rack



FIG. 1 is a reduced perspective view of a display rack showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof; and

FIG. 5 is a side view taken from the right of FIG. 2. 

The ornamental design for a display rack, substantially as shown and described. 